1561686342233 has 2 divisors, whose sum is σ = 1561686342234. Its totient is φ = 1561686342232.

The previous prime is 1561686342193. The next prime is 1561686342253. The reversal of 1561686342233 is 3322436861651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 912238932544 + 649447409689 = 955112^2 + 805883^2 .

It is an emirp because it is prime and its reverse (3322436861651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1561686342233 - 2⁶ = 1561686342169 is a prime.

It is not a weakly prime, because it can be changed into another prime (1561686342253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780843171116 + 780843171117.

It is an arithmetic number, because the mean of its divisors is an integer number (780843171117).

Almost surely, 2^{1561686342233} is an apocalyptic number.

It is an amenable number.

1561686342233 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561686342233 is an equidigital number, since it uses as much as digits as its factorization.

1561686342233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3732480, while the sum is 50.

The spelling of 1561686342233 in words is "one trillion, five hundred sixty-one billion, six hundred eighty-six million, three hundred forty-two thousand, two hundred thirty-three".